﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Linq;
using System.ComponentModel;
using System.Collections.Specialized;
using System.Diagnostics;

namespace Xceed.Silverlight.Data
{
  internal class SortingHandler : HandlerBase
  {
    public SortingHandler( )
    {
      m_sortDescriptions = new HandlerSortDescriptionCollection( ( object sender, NotifyCollectionChangedEventArgs args ) => OnSortDescriptionsChanged( args ) );
    }

    internal SortingHandler( SortingHandler copy )
      : this()
    {
      foreach( SortDescription sd in copy.m_sortDescriptions )
      {
        m_sortDescriptions.Add( sd );
      }
    }

    public SortDescriptionCollection SortDescriptions
    {
      get
      {
        return m_sortDescriptions;
      }
    }

    protected virtual void OnSortDescriptionsChanged( NotifyCollectionChangedEventArgs e )
    {
      this.RaiseSourceChanged( new SourceChangedEventArgs( SourceChangedType.SortingChanged ) );
    }

    private SortDescriptionCollection m_sortDescriptions;

    private class HandlerSortDescriptionCollection : SortDescriptionCollection
    {
      public HandlerSortDescriptionCollection( NotifyCollectionChangedEventHandler collectionChangeCallback )
      {
        this.CollectionChanged += collectionChangeCallback;
      }
    }
  }
}
